package com.iot.ammeter.config;

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.pagination.optimize.JsqlParserCountOptimize;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;

/**
 * @ClassName: MybatisPlusConfig
 * @Author: Basil
 * @Date: 2021/9/26 下午2:46
 * @Version: 1.0
 * @Description: MybatisPlus 配置类，分页插件
 **/
@Configuration
@EnableTransactionManagement
@MapperScan("com.iot.ammeter.mapper")
public class MybatisPlusConfig {
    // 旧版,分页插件
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        // 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求  默认false
        // paginationInterceptor.setOverflow(false);
        // 设置最大单页限制数量，默认 500 条，-1 不受限制
        // paginationInterceptor.setLimit(500);
        // 开启 count 的 join 优化,只针对部分 left join
        paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));
        return paginationInterceptor;
    }

    /**
     * 扩展mybatis-plus
     *
     * @return ExpandSqlInjector
     */
    @Bean
    public ExpandSqlInjector expandSqlInjector() {
        return new ExpandSqlInjector();
    }

}


